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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0b5958eaaac32bc9bca98ee656ac734eb52df414eadbfaa601babf13f33a83' 
  AND token = 'QYhwzPDKW9bgsgSF45tOahyX3X1TyvkwIzM31i7leoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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