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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f381ca47cc8baff2c942f1886b7295adcb5cc34c5e16e334ace37dc48ce9b8ca' 
  AND token = 'e7Z3zWF+2MB/Jo3XyL+DgDb6wGCiKrvEw2mIDJRE5aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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