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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0c610f4f9a9b18b532b28bcb1f04e563cdc0a7d4710d74f2180d7528725d3f' 
  AND token = 'KwnaJqEs6+tGNctldBsNROqLqPdxtGG3c1vDlPYgvNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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