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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c185948a761e0ef52a39c8a2d9144eef9bd8ef9956d39d0a41262917b8d28654' 
  AND token = 'Rwl3bEa8R7QtHejQt8nxAgygG0YvPTWK6+2Gx9JxfLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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