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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c779bc7e14664db121d9e22c260dd5ac861e4b12da743e47dcf24f9e259018c5' 
  AND token = 'uU4DaPNYNmx3xV1Y1Yl4Af+nFKpOC2PQImi1Kqqyk4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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