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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208205be6ffeb3c4cebc4b0c24d4fcfbf38d14bb62c8387a3d749418b2c73474' 
  AND token = 'yZ0UPBjsvCctdkby5mWXT/qFwGRxTtnRwK2bi5tAS0s=' 
  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"
    }
  }
}