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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b5a5107fa10782bf02f756c1c87f0a326a33e12d32a7357e9041b7cf163ad5' 
  AND token = 'SjuY1YpdZYmZ1CVRK5gWM9ZkZCBsGoRtLT6waw2hZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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