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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047fb8645beeb466ece8f7eab12b18b28bc2e82df2d4d945c88256b6e58041e8' 
  AND token = 'bLdSx1P+GsBE4HBnNGDbu7cgSjrW9ci+j7KvbMcw5EM=' 
  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"
    }
  }
}