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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3fe39cfaecda6284f02ce9fa371e7bb8d02cd7f4980cf3b0b93b0487c7ca36' 
  AND token = 'W2NWAxEqT1hnmjZu3CM/ZnWDoxd8Hb3i3xpgyrwWIlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}