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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045ee88c5d0f4ffa7312a1a3164fab6ade559cf892bc9518d305c41a728408ed' 
  AND token = 'wwcgxtoFmf6QRpbDBO88VLpwP0Gd0HACxhQ5QC9r2h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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