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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c22673e379214c6bf7273dcf798a19aea1999732a8610ee60c7e4e476645ac7' 
  AND token = '0gyRdTEGnzvnC8mYOE0ujBJdua71stFtgSNBnxpcYOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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