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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c9102eb0ef979000a49cf63abd1a2dad1a93e1e646a7a063083d0196cf3790' 
  AND token = 'IYhGHp7d5IXrFfVhcV88VAfXzRi0T26rFPxQz4gI8Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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