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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1110a46719f66101a06e11630c1dc2928ec6fd5fad90d7420b9b24fd5ee67bb' 
  AND token = 'OcXd6U4MtUi94+qMZyQirNRcu6CDY0ePcGW0Q6zAiXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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