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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb992f71ceebf34ede56d79a45477264fbbd54234323f5fa05b5f52f91c4426' 
  AND token = 'YCg3a7a9Jj++zp8os+lg32NiD8XGNaIQpaYWCGp40mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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