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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ac6d120e0fa94619fe718424a5b1f30d5e9e86c49fdbf31c90cd3843c1ff8e' 
  AND token = 'T6pKyHxqNr8zp+6YLHe2cNnVxpz7N5+LBFRHUyaoMJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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