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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f6a595b8efe7d3841dbc72aafd46efe0b6f1ecf633d81d403e39e2c5dec7b0' 
  AND token = 'QZfqy+8bQjuI0nNPyrM6Utc4uy3GDxVAuq69F6ZzSEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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