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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b36b84e5473aed4981e8b9743a1622b83b08bc5efb78b52fe25c8f7fde292c7' 
  AND token = 'M0Kg/AYv6BcE0cTs2k9xSVslGxoxNb2iGdF2xVRUrGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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