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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a6a4dadaff992b53a4dcc07650eeed01ee3b5b0bfad47c71201e3a51b56084' 
  AND token = '08RaMrkmgIfDiAZM0yWAVQL80FtIFU86+QPCVbDFzZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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