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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefed2180c3425bed53948e21d34c9979f6b0a2c465e3ee17f0e4fe3d118b36f' 
  AND token = 'fsS2ZoWc87hMMWZ3tLJ3svXbfpEnVjxM5/DKU412aU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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