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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6266c6f302192973fe6341c1e7a2f5622af8aaef10eed2f20f58108f7ae56608' 
  AND token = 'oVFhNLLK9EbiOgZTNxIfMa5HSMijszai+YtN3o16cls=' 
  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"
    }
  }
}