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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70d6129efdd910f5bd47dd588d192bbb467df9b68a3a43ea86be1dcf4968cdc' 
  AND token = 'qBzV3SzWjZr6aEfVGTlLZEeht37A33ZQLKg5B9FsQIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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