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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9bed63832bac9427ee584254f741c4e3a2c11aa59d969a1f361d75ff92a26f' 
  AND token = 'T0+jpJi+8pbytNGqf8A3rByN1hw4JtnYQVn4qSQK6EI=' 
  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"
    }
  }
}