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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac1fbcf991c05c2b90a044ea85ca48229e6cab61d94797a99db1d1783a5db17' 
  AND token = 'E72PyAq78h35u8efqq7nH7tTEu/DuQS8cXwJ/QPqY7Q=' 
  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"
    }
  }
}