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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f814026753d02c27034039f4d32c10def0d1c05ccfb5dfd1c8f95bd487ef01c9' 
  AND token = 'fmYg/3/6pdzMQ2K5pnl9lWl9cBVB8PGjkyv44l10ttA=' 
  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"
    }
  }
}