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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4756c6648a040a451a618a913a442f242ceb7d52a7d5e1703d605da58ac5dbb8' 
  AND token = 'i3Qgfwx6h8couWCiZK+4Kn75WZ72aqqyz36keH9cggc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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