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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af0a016d9102a90b5713799fab9f08338211e351d4f493933ae5fbc219af1c4' 
  AND token = 'ObPcI4U7YsZbV02y3wgdVUzFMHh8LoXuwNJFyNilXrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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