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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd02c7c0af67419059a49293798847017845d236d113504bea09741ac19ea28e' 
  AND token = 'ACw+bUK0s5vtMyMIhNrmoNPAB1QDYDM9VCQ5GGL3XHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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