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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910244a0bc979c494ed868ee13b72c73226ea950f55060c4028ffda887251184' 
  AND token = 'WC0XykqTvoFlfl11igE6ra6xDXmXxzagQpj2j9IN4Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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