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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98be5b1181f91d3cbef358db5eada043216b2fc2d9533215cd23f7fdc84aa6e8' 
  AND token = 'sKTLS09Q4H3mVkXYo/ja5gP98saoiKAXmynkl//fapI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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