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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49eadf5e7730b65c40e710feedfcd4ae5fb05246d7bbc363b007431e5a87031e' 
  AND token = 'ODsyTtealCw2L7HPKme17wmOau95xeZmFjKVzxlu3kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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