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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1b23b2d05e44baf8c4ce7275ad06385251acacf52516c18b76301eedf00b22' 
  AND token = 'bRQyJuE9BCenOs0SumdaLQtKpoijABVRgGtxlKC8ULI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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