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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc6f641921d12d099ff569417aa043de5f818c4b7b7aa5430d2f011eedad2c2' 
  AND token = 'lY8T4LE/S4dAW/JTOZ5T2kKCbJxOEOdxCu2z7Eubem0=' 
  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"
    }
  }
}