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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ef4ec3d1a15b9a633d94c4c7a969c9d26ce2fdbd26f003c9a264cf1695c6f4' 
  AND token = 'QvS1I6raSG/dhtfduwrJOleuXlQ0jZ23nO39D7Bx9No=' 
  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"
    }
  }
}