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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07dec88aa2848b0ff28e5b7f731c38e5775a1e5ced371f687ca0cebac63abf0d' 
  AND token = 'ITLifB0gMnpK9PvY+ZIt8T1V6mrNULrkbc2kV91+r+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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