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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b325ab7c70437569b6d60127481f373d5aa645de52086b69175198c143250f9' 
  AND token = 'cHdU4oVqHfkL/lbvkhqSfqoVI8wr36D08fUtYbwlY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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