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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633f56e4d186fe8ff1ee3703ef191ae959c8580038a8c307639cf47fb4914695' 
  AND token = '0hrekJWniUGOjHjv7shKlB0gm01veVQdwGT7nIgML1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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