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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11c0be018168472672503faf03b9a2d116d9c9f82b61af06616f5c91ee8d205' 
  AND token = 'uEgoddzyDhTIGIJ/8QUJPs30cVwW2+ipWHURM/Nx08E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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