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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a82cbcd1080d00c3c656a4744c47e2cf1c34da4f4eff7ea5b98a6a56bc13169' 
  AND token = 'EXxwzG5PXVFD0o1nVZQO204/JsTLMcBWKYMTQ2EFc+c=' 
  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"
    }
  }
}