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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f90c2fd68dc206062b62ff47a9b9e75fcd0bf8b8e0f4d902b56b9564c76476' 
  AND token = 'D7e0GJcO4II+dMx1SqDfLlP3VaOf40cgwAJyvI0ZH5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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