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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b859ec325c982ad0f4ffa8fe3613ee641c19ca0e642ceafae44c1ca00157a69' 
  AND token = 'Cn7VfNbDoG1N17WXSu9Ik0OqexD6v4aa6SYWGKGKdXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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