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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24312be14b7d8dcf9557a5e74f4ef759e2415fe9b7bfdcb0f477c7c47de2030' 
  AND token = 'dL66kxWvLuXC1qmUrgnTo6Ll5doQkZsFQRVO75xlLG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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