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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68310517e0c055c2bd5d1f174a5b6f3aa4d75f89f81759107d3c60e8d0f5051c' 
  AND token = 'FAvsP3ZDRdPKsDwnnyMkd8+17YrHOdoOC1oNg3cf4aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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