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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc86e2ecc877d6765b5d59f7cac410c7edd46ad3952a9ea5fb4a95d170b678ac' 
  AND token = 'VJdE5XhhVP5l6fnVg/vospJuE0BdI3M7GCkrkYiME5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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