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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95127645bac21e9b7bc1857b6569cb3b4d571ffbdb4f835a82a56f04548d559f' 
  AND token = '4fHL/txzTZ3PeCi21c011ne8nysPldj3lwtmA98x29U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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