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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9de67a8c0dd52e9da14a2e6b9870a7a7dae0030c690f26e68fef3c74206f3e' 
  AND token = 'HGPvQnBF+shGddaF5NYfID7CP+IG3xyD+oWaIOvI1Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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