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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8787003aec91c315e89ae076895ac229988c6120d9706a665629e8c92f6968ad' 
  AND token = 'Y98dyaEeuSGtL40Bdl+PlMN7TW/Zj5+2LMacfkm3DJU=' 
  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"
    }
  }
}