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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6da99b75e6ab63236fd2d2c237f0b3521e35f574fd16dfe3b29a45a2f3b0fd8' 
  AND token = 'pX5Kt/JSfffIrUt4ikZiOSZMpdrX8Hlh3YdZmxL/bBI=' 
  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"
    }
  }
}