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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53784c1526c3a58bae579d92f854cd9ec798acd75d00f66b5ce8a84d9d03b49a' 
  AND token = 'iWvc5890W3aBTfTevrYJLoLSZW4zNHqcK2wazWnWPE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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