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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b35535c7a91cc4c5128bed481b8125421e894954bb78ce2d9408c5809092ff5' 
  AND token = 'zngZlY1kmMR9+Alp692L5JWUNdGdk1N54gn9SHgWuWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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